INNER CODE UNIT · TypeScript

addHelper

f5/unovis · packages/mcp/src/codegen/index.ts:83

function addHelper (emit: Emit, code: string): void {
  if (!emit.helpers.includes(code)) emit.helpers.push(code)
}

/** An accessor descriptor as a source expression */
function accessorExpression (ref: AccessorRef, emit: Emit): string {
  if ('$field' in ref) {
    const access = `d.${/^[A-Za-z_$][\w$]*$/.test(ref.$field) ? ref.$field : `['${ref.$field}']`}`
    if (ref.as === 'date') return `d => new Date(${access}).getTime()`
    return `d => ${access}`
  }
  if ('$index' in ref) return '(d, i) => i'
  if ('$const' in ref) return `() => ${json(ref.$const)}`
  if ('$numTickFormat' in ref) {
    addHelper(emit, "const formatNumber = (value: number | Date): string =>\n  Number(value).toLocaleString('en-US', { maximumFractionDigits: 6 })")
    return 'formatNumber'
  }
  if ('$dateTickFormat' in ref) {

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